Compressor for refrigerating-machines.



Patented July 3|, I900.

I H. RENNO. COMPRESSOR FOR BEFRIGERATING MACHINES.

(Application filed Feb. 2, 1900.)

(No Model.)

m: NORRIS rztcas co. wum-umu. wnsmua PATENT OFFICE.

HEINRICH RENNO, OF HOERDE, GERMANY.

COMPRESSOR FOR REFRIGERATING-MAOHINES SPECIFICATION forming part ofLetters latent No. 655,120, dated July 31, 1900. Application filedFebruary 2, 1900. Serial No. 3.732. (No model.)

To ail whom it may concern.-

Be it known thatLHErNRIoH RENNO, mechanician, of 132Wellinghoferstrasse, Hoerde, Westphalia, in the German Empire, haveinvented Improvements in Compressors for Use with Refrigerating-Machinesgand I do hereby declare the nature of this invention and in what mannerthe same is to be performed to be particularly described and ascertainedin and by the following statement, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

This invention relates to an improved construction of compressor for usewith refrigerating-machines, which allows the cold expanded gas comingfrom the expansion-chamber after effecting the refrigeration to beapplied to the compressed, and therefore heated, gas from thecompressor, thus obtaining an economy in the water required for coolingand also hastening the cooling process itself.

Referring to the annexed drawings, Figure 1 shows a vertical transversesection through the compressor cylindrical chamber, and Fig. 2 ahorizontal section on the line A B of Fig. 1.

Upon the compressor-body a is arranged a cylindrical chamber a, thecompression-cylinderbbeing, as shown at Fig. 1, horizontal andsurrounded by two concentric jackets d and f. These latter are continuedupward into the cylindrical chamber 0, the inner one as an axial chamberand the outer one as an annular jacket around said chamber. The outerjacket 01 is connected with the expansion chamber through thesuction-pipe, while the upperchamber portion of the inner jacket f iscontinued into an oil-compartmente,aspring-controlled lift-valve beingarranged above the said jacket. The compressor is provided in thewell-known manner with autom atic valves are n 0 p.

The motion of the piston 9 causes the gas obtained by expansion in theexpansion chamber to be drawn through the outer jacket d, while the gascompressed by the piston is forced through the jacket f, adjacent to thecompression-cylinder, and in a compressed condition driven into theupper chamber and thence to the pressure-pipe and the condenser. By theforward stroke of the piston, as drawn in Fig. 2, one valve m of thevalves lyingbe hind the piston will be lifted from its seat. Theexpanded gas in the outer jacket (1 will be drawn in and enter thecompression-cylinder b behind the piston 9. Meanwhile the second valve nis closed. Of the two valves 0 and p in front of the piston this motionof the piston will open the former, while the valve 19 will be depressedupon itsseating, so that the compressed gas will be forced to passthrough into the jacket f and thence to the upper chamber of the latterbefore it can enter the pressure-pipe. By the backward stroke of thepiston g the motion of the valves will be in the opposite direction. Theouter or suction jacket will be closed by means of the valve m, whilethe inner or compression jacket will be put in communication through theopen valve or with the compression-cylinder. The expanded gases will bedrawn through the annular chamber (1 and the valve 11, while the valve 0will close the compression-jacket.

On its Way to the pressure-pipe the compressed gas will be cooled by theexpanded gas in the space (1, so that it must part with a considerableportion of its heat before it onters the condenser, in consequence ofwhich a much lessintense refrigeration is required in the latter toaccomplish the condensation ofthe gas. By suitably modifying the head a,and with it both the concentric spaces f and d, the cooling can befurther increased.

By the employment of this invention considerable economy is effected asregards the water for cooling, and at the same time a more rapidrefrigeration is obtained than was the case with former compressors.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is- A compressor for refrigerating-machines having,arranged around the compressionchamber, two concentric jackets continuedinto the. cylindrical chamber thereof as central and annular passages,the outer completing the communication with the suction-pipe and theinner that with the pressure-pipe, for the purpose of more intensecooling of the compressed outgoing gas by means of the expanded incominggas.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

HEINRICH RENNO.

Witnesses:

Orro KoNre, J. A. RrrrERsHAUs.

